Sedimentary environment and provenance of sandstones from the Qadir member in the Nayband Formation, Tabas block, east-central Iran

IF 0.5 4区地球科学 Q4 GEOLOGY

Boletin De La Sociedad Geologica Mexicana Pub Date : 2021-04-01 DOI:10.18268/BSGM2021V73N1A140920

Ehsan Zamaniyan, M. Khanehbad, R. Moussavi-Harami, A. Mahboubi

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引用次数: 2

Abstract

Qadir Member of Nayband Formation, located in East of Central Iran, has developed to a great extent. Investigation of the lithofacies and sedimentary environment, resulted in identification of the deltaic and marine deposits. Based on field evidence and facies features, Qadir Member consists of two lithofacies, including carbonate and siliciclastic facies. The siliciclastic facies were identified as having four sandstone facies including Sr, Sh, Sp, St, three fine-grained lithofacies, including FI, Fm, Fl (Sr) / Sr (FI) and one coal facies. Also, regarding the field, laboratory studies, and identification of lithofacies, the coastal plain, deltaic (including deltaic plain, proximal delta front, distal delta front, and prodelta) and open marine environments were identified for Qadir Member which is is under the impact of tidal currents. The chemical weathering index (71%) indicated semi-arid to semi-humid conditions and plotting the geochemical data showed the provenance of re-cycling and active continental margin and because of Chemical Index of Alteration, the weathering rate was found to be rather medium to high. The geochemical diagrams also showed a probable source of the intermediate igneous and sedimentary rocks. The active continental margin conditions for this deposit could suggest the Neotethys subduction under Iran’s plate and volcanic activity at the end of Triassic, which coincided with the early Cimmerian orogeny in Alborz and Central East Iranian Microcontinent.

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伊朗中东部塔巴斯区块Nayband组Qadir段砂岩的沉积环境和物源

Nayband组Qadir段位于伊朗中部偏东，发育程度较大。对岩相和沉积环境的调查，确定了三角洲和海洋沉积物。根据野外证据和岩相特征，Qadir段由碳酸盐相和硅质碎屑两个岩相组成。硅化碎屑相具有四个砂岩相，包括Sr、Sh、Sp、St，三个细粒岩相，包括FI、Fm、Fl（Sr）/Sr（FI）和一个煤相。此外，就现场、实验室研究和岩相鉴定而言，Qadir段的海岸平原、三角洲（包括三角洲平原、近端三角洲前缘、远端三角洲前缘和前三角洲）和开阔海洋环境均受到潮流的影响。化学风化指数（71%）表明半干旱至半湿润条件，绘制地球化学数据显示了再循环和活动大陆边缘的来源，由于蚀变化学指数，风化率相当中等至较高。地球化学图还显示了中间火成岩和沉积岩的可能来源。该矿床的活跃大陆边缘条件可能表明，三叠纪末，新特提斯在伊朗板块下俯冲和火山活动，这与阿尔博茨和伊朗中东微大陆的早期Cimmerian造山运动相吻合。

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来源期刊

Boletin De La Sociedad Geologica Mexicana GEOLOGY-

CiteScore

1.40

自引率

12.50%

发文量

审稿时长

50 weeks

期刊介绍： The Boletín de la Sociedad Geológica Mexicana is a completely free-access electronic journal published semi-annually that publishes papers and technical notes with its main objective to contribute to an understanding of the geology of Mexico, of its neighbor areas, and of geologically similar areas anywhere on Earth’s crust. Geology has no boundaries so we may publish papers on any area of knowledge that is interesting to our readers. We also favor the publication of papers on relatively unfamiliar subjects and objectives in mainstream journals, e.g., papers devoted to new methodologies or their improvement, and areas of knowledge that in the past had relatively little attention paid them in Mexican journals, such as urban geology, water management, environmental geology, and ore deposits, among others. Mexico is a land of volcanos, earthquakes, vast resources in minerals and petroleum, and a shortage of water. Consequently, these topics should certainly be of major interest to our readers, our Society, and society in general. Furthermore, the Boletín has been published since 1904; that makes it one of the oldest scientific journals currently active in Mexico and, most notably, its entire contents, from the first issue on, are available online.